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# Copyright (C) 2012 Canonical Ltd.
# Copyright (C) 2012, 2013 Hewlett-Packard Development Company, L.P.
# Copyright (C) 2012 Yahoo! Inc.
#
# This file is part of cloud-init. See LICENSE file for license information.
import copy
import os
import sys
from collections import namedtuple
from typing import Dict, Iterable, List, Optional, Set
from cloudinit import cloud, distros, handlers, helpers, importer
from cloudinit import log as logging
from cloudinit import net, sources, type_utils, util
from cloudinit.event import EventScope, EventType, userdata_to_events
# Default handlers (used if not overridden)
from cloudinit.handlers.boot_hook import BootHookPartHandler
from cloudinit.handlers.cloud_config import CloudConfigPartHandler
from cloudinit.handlers.jinja_template import JinjaTemplatePartHandler
from cloudinit.handlers.shell_script import ShellScriptPartHandler
from cloudinit.handlers.shell_script_by_frequency import (
ShellScriptByFreqPartHandler,
)
from cloudinit.net import cmdline
from cloudinit.reporting import events
from cloudinit.settings import (
CLOUD_CONFIG,
PER_ALWAYS,
PER_INSTANCE,
PER_ONCE,
RUN_CLOUD_CONFIG,
)
from cloudinit.sources import NetworkConfigSource
LOG = logging.getLogger(__name__)
NO_PREVIOUS_INSTANCE_ID = "NO_PREVIOUS_INSTANCE_ID"
def update_event_enabled(
datasource: sources.DataSource,
cfg: dict,
event_source_type: EventType,
scope: Optional[EventScope] = None,
) -> bool:
"""Determine if a particular EventType is enabled.
For the `event_source_type` passed in, check whether this EventType
is enabled in the `updates` section of the userdata. If `updates`
is not enabled in userdata, check if defined as one of the
`default_events` on the datasource. `scope` may be used to
narrow the check to a particular `EventScope`.
Note that on first boot, userdata may NOT be available yet. In this
case, we only have the data source's `default_update_events`,
so an event that should be enabled in userdata may be denied.
"""
default_events: Dict[
EventScope, Set[EventType]
] = datasource.default_update_events
user_events: Dict[EventScope, Set[EventType]] = userdata_to_events(
cfg.get("updates", {})
)
# A value in the first will override a value in the second
allowed = util.mergemanydict(
[
copy.deepcopy(user_events),
copy.deepcopy(default_events),
]
)
LOG.debug("Allowed events: %s", allowed)
scopes: Iterable[EventScope]
if not scope:
scopes = allowed.keys()
else:
scopes = [scope]
scope_values = [s.value for s in scopes]
for evt_scope in scopes:
if event_source_type in allowed.get(evt_scope, []):
LOG.debug(
"Event Allowed: scope=%s EventType=%s",
evt_scope.value,
event_source_type,
)
return True
LOG.debug(
"Event Denied: scopes=%s EventType=%s", scope_values, event_source_type
)
return False
class Init:
def __init__(self, ds_deps: Optional[List[str]] = None, reporter=None):
if ds_deps is not None:
self.ds_deps = ds_deps
else:
self.ds_deps = [sources.DEP_FILESYSTEM, sources.DEP_NETWORK]
# Created on first use
self._cfg: Optional[dict] = None
self._paths: Optional[helpers.Paths] = None
self._distro: Optional[distros.Distro] = None
# Changed only when a fetch occurs
self.datasource: Optional[sources.DataSource] = None
self.ds_restored = False
self._previous_iid = None
if reporter is None:
reporter = events.ReportEventStack(
name="init-reporter",
description="init-desc",
reporting_enabled=False,
)
self.reporter = reporter
def _reset(self, reset_ds=False):
# Recreated on access
self._cfg = None
self._paths = None
self._distro = None
if reset_ds:
self.datasource = None
self.ds_restored = False
@property
def distro(self):
if not self._distro:
# Try to find the right class to use
system_config = self._extract_cfg("system")
distro_name = system_config.pop("distro", "ubuntu")
distro_cls = distros.fetch(distro_name)
LOG.debug("Using distro class %s", distro_cls)
self._distro = distro_cls(distro_name, system_config, self.paths)
# If we have an active datasource we need to adjust
# said datasource and move its distro/system config
# from whatever it was to a new set...
if self.datasource is not None:
self.datasource.distro = self._distro
self.datasource.sys_cfg = self.cfg
return self._distro
@property
def cfg(self):
return self._extract_cfg("restricted")
def _extract_cfg(self, restriction):
# Ensure actually read
self.read_cfg()
# Nobody gets the real config
ocfg = copy.deepcopy(self._cfg)
if restriction == "restricted":
ocfg.pop("system_info", None)
elif restriction == "system":
ocfg = util.get_cfg_by_path(ocfg, ("system_info",), {})
elif restriction == "paths":
ocfg = util.get_cfg_by_path(ocfg, ("system_info", "paths"), {})
if not isinstance(ocfg, (dict)):
ocfg = {}
return ocfg
@property
def paths(self):
if not self._paths:
path_info = self._extract_cfg("paths")
self._paths = helpers.Paths(path_info, self.datasource)
return self._paths
def _initial_subdirs(self):
c_dir = self.paths.cloud_dir
run_dir = self.paths.run_dir
initial_dirs = [
c_dir,
os.path.join(c_dir, "scripts"),
os.path.join(c_dir, "scripts", "per-instance"),
os.path.join(c_dir, "scripts", "per-once"),
os.path.join(c_dir, "scripts", "per-boot"),
os.path.join(c_dir, "scripts", "vendor"),
os.path.join(c_dir, "seed"),
os.path.join(c_dir, "instances"),
os.path.join(c_dir, "handlers"),
os.path.join(c_dir, "sem"),
os.path.join(c_dir, "data"),
os.path.join(run_dir, "sem"),
]
return initial_dirs
def purge_cache(self, rm_instance_lnk=False):
rm_list = [self.paths.boot_finished]
if rm_instance_lnk:
rm_list.append(self.paths.instance_link)
for f in rm_list:
util.del_file(f)
return len(rm_list)
def initialize(self):
self._initialize_filesystem()
def _initialize_filesystem(self):
util.ensure_dirs(self._initial_subdirs())
log_file = util.get_cfg_option_str(self.cfg, "def_log_file")
if log_file:
# At this point the log file should have already been created
# in the setupLogging function of log.py
util.ensure_file(log_file, mode=0o640, preserve_mode=False)
perms = self.cfg.get("syslog_fix_perms")
if not perms:
perms = {}
if not isinstance(perms, list):
perms = [perms]
error = None
for perm in perms:
u, g = util.extract_usergroup(perm)
try:
util.chownbyname(log_file, u, g)
return
except OSError as e:
error = e
LOG.warning(
"Failed changing perms on '%s'. tried: %s. %s",
log_file,
",".join(perms),
error,
)
def read_cfg(self, extra_fns=None):
# None check so that we don't keep on re-loading if empty
if self._cfg is None:
self._cfg = self._read_cfg(extra_fns)
# LOG.debug("Loaded 'init' config %s", self._cfg)
def _read_cfg(self, extra_fns):
no_cfg_paths = helpers.Paths({}, self.datasource)
instance_data_file = no_cfg_paths.get_runpath(
"instance_data_sensitive"
)
merger = helpers.ConfigMerger(
paths=no_cfg_paths,
datasource=self.datasource,
additional_fns=extra_fns,
base_cfg=fetch_base_config(instance_data_file=instance_data_file),
)
return merger.cfg
def _restore_from_cache(self):
# We try to restore from a current link and static path
# by using the instance link, if purge_cache was called
# the file wont exist.
return sources.pkl_load(self.paths.get_ipath_cur("obj_pkl"))
def _write_to_cache(self):
if self.datasource is None:
return False
if util.get_cfg_option_bool(self.cfg, "manual_cache_clean", False):
# The empty file in instance/ dir indicates manual cleaning,
# and can be read by ds-identify.
util.write_file(
self.paths.get_ipath_cur("manual_clean_marker"),
omode="w",
content="",
)
return sources.pkl_store(
self.datasource, self.paths.get_ipath_cur("obj_pkl")
)
def _get_datasources(self):
# Any config provided???
pkg_list = self.cfg.get("datasource_pkg_list") or []
# Add the defaults at the end
for n in ["", type_utils.obj_name(sources)]:
if n not in pkg_list:
pkg_list.append(n)
cfg_list = self.cfg.get("datasource_list") or []
return (cfg_list, pkg_list)
def _restore_from_checked_cache(self, existing):
if existing not in ("check", "trust"):
raise ValueError("Unexpected value for existing: %s" % existing)
ds = self._restore_from_cache()
if not ds:
return (None, "no cache found")
run_iid_fn = self.paths.get_runpath("instance_id")
if os.path.exists(run_iid_fn):
run_iid = util.load_file(run_iid_fn).strip()
else:
run_iid = None
if run_iid == ds.get_instance_id():
return (ds, "restored from cache with run check: %s" % ds)
elif existing == "trust":
return (ds, "restored from cache: %s" % ds)
else:
if hasattr(ds, "check_instance_id") and ds.check_instance_id(
self.cfg
):
return (ds, "restored from checked cache: %s" % ds)
else:
return (None, "cache invalid in datasource: %s" % ds)
def _get_data_source(self, existing) -> sources.DataSource:
if self.datasource is not None:
return self.datasource
with events.ReportEventStack(
name="check-cache",
description="attempting to read from cache [%s]" % existing,
parent=self.reporter,
) as myrep:
ds, desc = self._restore_from_checked_cache(existing)
myrep.description = desc
self.ds_restored = bool(ds)
LOG.debug(myrep.description)
if not ds:
util.del_file(self.paths.instance_link)
(cfg_list, pkg_list) = self._get_datasources()
# Deep copy so that user-data handlers can not modify
# (which will affect user-data handlers down the line...)
(ds, dsname) = sources.find_source(
self.cfg,
self.distro,
self.paths,
copy.deepcopy(self.ds_deps),
cfg_list,
pkg_list,
self.reporter,
)
LOG.info("Loaded datasource %s - %s", dsname, ds)
self.datasource = ds
# Ensure we adjust our path members datasource
# now that we have one (thus allowing ipath to be used)
self._reset()
return ds
def _get_instance_subdirs(self):
return ["handlers", "scripts", "sem"]
def _get_ipath(self, subname=None):
# Force a check to see if anything
# actually comes back, if not
# then a datasource has not been assigned...
instance_dir = self.paths.get_ipath(subname)
if not instance_dir:
raise RuntimeError(
"No instance directory is available."
" Has a datasource been fetched??"
)
return instance_dir
def _reflect_cur_instance(self):
# Remove the old symlink and attach a new one so
# that further reads/writes connect into the right location
idir = self._get_ipath()
util.del_file(self.paths.instance_link)
util.sym_link(idir, self.paths.instance_link)
# Ensures these dirs exist
dir_list = []
for d in self._get_instance_subdirs():
dir_list.append(os.path.join(idir, d))
util.ensure_dirs(dir_list)
# Write out information on what is being used for the current instance
# and what may have been used for a previous instance...
dp = self.paths.get_cpath("data")
# Write what the datasource was and is..
ds = "%s: %s" % (type_utils.obj_name(self.datasource), self.datasource)
previous_ds = None
ds_fn = os.path.join(idir, "datasource")
try:
previous_ds = util.load_file(ds_fn).strip()
except Exception:
pass
if not previous_ds:
previous_ds = ds
util.write_file(ds_fn, "%s\n" % ds)
util.write_file(
os.path.join(dp, "previous-datasource"), "%s\n" % (previous_ds)
)
# What the instance id was and is...
iid = self.datasource.get_instance_id()
iid_fn = os.path.join(dp, "instance-id")
previous_iid = self.previous_iid()
util.write_file(iid_fn, "%s\n" % iid)
util.write_file(self.paths.get_runpath("instance_id"), "%s\n" % iid)
util.write_file(
os.path.join(dp, "previous-instance-id"), "%s\n" % (previous_iid)
)
self._write_to_cache()
# Ensure needed components are regenerated
# after change of instance which may cause
# change of configuration
self._reset()
return iid
def previous_iid(self):
if self._previous_iid is not None:
return self._previous_iid
dp = self.paths.get_cpath("data")
iid_fn = os.path.join(dp, "instance-id")
try:
self._previous_iid = util.load_file(iid_fn).strip()
except Exception:
self._previous_iid = NO_PREVIOUS_INSTANCE_ID
LOG.debug("previous iid found to be %s", self._previous_iid)
return self._previous_iid
def is_new_instance(self):
"""Return true if this is a new instance.
If datasource has already been initialized, this will return False,
even on first boot.
"""
previous = self.previous_iid()
ret = (
previous == NO_PREVIOUS_INSTANCE_ID
or previous != self.datasource.get_instance_id()
)
return ret
def fetch(self, existing="check"):
return self._get_data_source(existing=existing)
def instancify(self):
return self._reflect_cur_instance()
def cloudify(self):
# Form the needed options to cloudify our members
return cloud.Cloud(
self.datasource,
self.paths,
self.cfg,
self.distro,
helpers.Runners(self.paths),
reporter=self.reporter,
)
def update(self):
self._store_rawdata(self.datasource.get_userdata_raw(), "userdata")
self._store_processeddata(self.datasource.get_userdata(), "userdata")
self._store_raw_vendordata(
self.datasource.get_vendordata_raw(), "vendordata"
)
self._store_processeddata(
self.datasource.get_vendordata(), "vendordata"
)
self._store_raw_vendordata(
self.datasource.get_vendordata2_raw(), "vendordata2"
)
self._store_processeddata(
self.datasource.get_vendordata2(), "vendordata2"
)
def setup_datasource(self):
with events.ReportEventStack(
"setup-datasource", "setting up datasource", parent=self.reporter
):
if self.datasource is None:
raise RuntimeError("Datasource is None, cannot setup.")
self.datasource.setup(is_new_instance=self.is_new_instance())
def activate_datasource(self):
with events.ReportEventStack(
"activate-datasource",
"activating datasource",
parent=self.reporter,
):
if self.datasource is None:
raise RuntimeError("Datasource is None, cannot activate.")
self.datasource.activate(
cfg=self.cfg, is_new_instance=self.is_new_instance()
)
self._write_to_cache()
def _store_rawdata(self, data, datasource):
# Raw data is bytes, not a string
if data is None:
data = b""
util.write_file(self._get_ipath("%s_raw" % datasource), data, 0o600)
def _store_raw_vendordata(self, data, datasource):
# Only these data types
if data is not None and type(data) not in [bytes, str, list]:
raise TypeError(
"vendordata_raw is unsupported type '%s'" % str(type(data))
)
# This data may be a list, convert it to a string if so
if isinstance(data, list):
data = util.json_dumps(data)
self._store_rawdata(data, datasource)
def _store_processeddata(self, processed_data, datasource):
# processed is a Mime message, so write as string.
if processed_data is None:
processed_data = ""
util.write_file(
self._get_ipath(datasource), str(processed_data), 0o600
)
def _default_handlers(self, opts=None) -> List[handlers.Handler]:
if opts is None:
opts = {}
opts.update(
{
"paths": self.paths,
"datasource": self.datasource,
}
)
# TODO(harlowja) Hmmm, should we dynamically import these??
cloudconfig_handler = CloudConfigPartHandler(**opts)
shellscript_handler = ShellScriptPartHandler(**opts)
def_handlers = [
cloudconfig_handler,
shellscript_handler,
ShellScriptByFreqPartHandler(PER_ALWAYS, **opts),
ShellScriptByFreqPartHandler(PER_INSTANCE, **opts),
ShellScriptByFreqPartHandler(PER_ONCE, **opts),
BootHookPartHandler(**opts),
JinjaTemplatePartHandler(
**opts, sub_handlers=[cloudconfig_handler, shellscript_handler]
),
]
return def_handlers
def _default_userdata_handlers(self):
return self._default_handlers()
def _default_vendordata_handlers(self):
return self._default_handlers(
opts={
"script_path": "vendor_scripts",
"cloud_config_path": "vendor_cloud_config",
}
)
def _default_vendordata2_handlers(self):
return self._default_handlers(
opts={
"script_path": "vendor_scripts",
"cloud_config_path": "vendor2_cloud_config",
}
)
def _do_handlers(
self, data_msg, c_handlers_list, frequency, excluded=None
):
"""
Generalized handlers suitable for use with either vendordata
or userdata
"""
if excluded is None:
excluded = []
cdir = self.paths.get_cpath("handlers")
idir = self._get_ipath("handlers")
# Add the path to the plugins dir to the top of our list for importing
# new handlers.
#
# Note(harlowja): instance dir should be read before cloud-dir
for d in [cdir, idir]:
if d and d not in sys.path:
sys.path.insert(0, d)
def register_handlers_in_dir(path):
# Attempts to register any handler modules under the given path.
if not path or not os.path.isdir(path):
return
potential_handlers = util.get_modules_from_dir(path)
for (fname, mod_name) in potential_handlers.items():
try:
mod_locs, looked_locs = importer.find_module(
mod_name, [""], ["list_types", "handle_part"]
)
if not mod_locs:
LOG.warning(
"Could not find a valid user-data handler"
" named %s in file %s (searched %s)",
mod_name,
fname,
looked_locs,
)
continue
mod = importer.import_module(mod_locs[0])
mod = handlers.fixup_handler(mod)
types = c_handlers.register(mod)
if types:
LOG.debug(
"Added custom handler for %s [%s] from %s",
types,
mod,
fname,
)
except Exception:
util.logexc(
LOG, "Failed to register handler from %s", fname
)
# This keeps track of all the active handlers
c_handlers = helpers.ContentHandlers()
# Add any handlers in the cloud-dir
register_handlers_in_dir(cdir)
# Register any other handlers that come from the default set. This
# is done after the cloud-dir handlers so that the cdir modules can
# take over the default user-data handler content-types.
for mod in c_handlers_list:
types = c_handlers.register(mod, overwrite=False)
if types:
LOG.debug("Added default handler for %s from %s", types, mod)
# Form our cloud interface
data = self.cloudify()
def init_handlers():
# Init the handlers first
for (_ctype, mod) in c_handlers.items():
if mod in c_handlers.initialized:
# Avoid initiating the same module twice (if said module
# is registered to more than one content-type).
continue
handlers.call_begin(mod, data, frequency)
c_handlers.initialized.append(mod)
def walk_handlers(excluded):
# Walk the user data
part_data = {
"handlers": c_handlers,
# Any new handlers that are encountered get writen here
"handlerdir": idir,
"data": data,
# The default frequency if handlers don't have one
"frequency": frequency,
# This will be used when new handlers are found
# to help write their contents to files with numbered
# names...
"handlercount": 0,
"excluded": excluded,
}
handlers.walk(data_msg, handlers.walker_callback, data=part_data)
def finalize_handlers():
# Give callbacks opportunity to finalize
for (_ctype, mod) in c_handlers.items():
if mod not in c_handlers.initialized:
# Said module was never inited in the first place, so lets
# not attempt to finalize those that never got called.
continue
c_handlers.initialized.remove(mod)
try:
handlers.call_end(mod, data, frequency)
except Exception:
util.logexc(LOG, "Failed to finalize handler: %s", mod)
try:
init_handlers()
walk_handlers(excluded)
finally:
finalize_handlers()
def consume_data(self, frequency=PER_INSTANCE):
# Consume the userdata first, because we need want to let the part
# handlers run first (for merging stuff)
with events.ReportEventStack(
"consume-user-data",
"reading and applying user-data",
parent=self.reporter,
):
if util.get_cfg_option_bool(self.cfg, "allow_userdata", True):
self._consume_userdata(frequency)
else:
LOG.debug("allow_userdata = False: discarding user-data")
with events.ReportEventStack(
"consume-vendor-data",
"reading and applying vendor-data",
parent=self.reporter,
):
self._consume_vendordata("vendordata", frequency)
with events.ReportEventStack(
"consume-vendor-data2",
"reading and applying vendor-data2",
parent=self.reporter,
):
self._consume_vendordata("vendordata2", frequency)
# Perform post-consumption adjustments so that
# modules that run during the init stage reflect
# this consumed set.
#
# They will be recreated on future access...
self._reset()
# Note(harlowja): the 'active' datasource will have
# references to the previous config, distro, paths
# objects before the load of the userdata happened,
# this is expected.
def _consume_vendordata(self, vendor_source, frequency=PER_INSTANCE):
"""
Consume the vendordata and run the part handlers on it
"""
# User-data should have been consumed first.
# So we merge the other available cloud-configs (everything except
# vendor provided), and check whether or not we should consume
# vendor data at all. That gives user or system a chance to override.
if vendor_source == "vendordata":
if not self.datasource.get_vendordata_raw():
LOG.debug("no vendordata from datasource")
return
cfg_name = "vendor_data"
elif vendor_source == "vendordata2":
if not self.datasource.get_vendordata2_raw():
LOG.debug("no vendordata2 from datasource")
return
cfg_name = "vendor_data2"
else:
raise RuntimeError(
"vendor_source arg must be either 'vendordata'"
" or 'vendordata2'"
)
_cc_merger = helpers.ConfigMerger(
paths=self._paths,
datasource=self.datasource,
additional_fns=[],
base_cfg=self.cfg,
include_vendor=False,
)
vdcfg = _cc_merger.cfg.get(cfg_name, {})
if not isinstance(vdcfg, dict):
vdcfg = {"enabled": False}
LOG.warning(
"invalid %s setting. resetting to: %s", cfg_name, vdcfg
)
enabled = vdcfg.get("enabled")
no_handlers = vdcfg.get("disabled_handlers", None)
if not util.is_true(enabled):
LOG.debug("%s consumption is disabled.", vendor_source)
return
if isinstance(enabled, str):
LOG.debug(
"Use of string '%s' for 'vendor_data:enabled' field "
"is deprecated. Use boolean value instead",
enabled,
)
LOG.debug(
"%s will be consumed. disabled_handlers=%s",
vendor_source,
no_handlers,
)
# Ensure vendordata source fetched before activation (just in case.)
# c_handlers_list keeps track of all the active handlers, while
# excluding what the users doesn't want run, i.e. boot_hook,
# cloud_config, shell_script
if vendor_source == "vendordata":
vendor_data_msg = self.datasource.get_vendordata()
c_handlers_list = self._default_vendordata_handlers()
else:
vendor_data_msg = self.datasource.get_vendordata2()
c_handlers_list = self._default_vendordata2_handlers()
# Run the handlers
self._do_handlers(
vendor_data_msg, c_handlers_list, frequency, excluded=no_handlers
)
def _consume_userdata(self, frequency=PER_INSTANCE):
"""
Consume the userdata and run the part handlers
"""
# Ensure datasource fetched before activation (just incase)
user_data_msg = self.datasource.get_userdata(True)
# This keeps track of all the active handlers
c_handlers_list = self._default_handlers()
# Run the handlers
self._do_handlers(user_data_msg, c_handlers_list, frequency)
def _get_network_key_contents(self, cfg) -> dict:
"""
Network configuration can be passed as a dict under a "network" key, or
optionally at the top level. In both cases, return the config.
"""
if cfg and "network" in cfg:
return cfg["network"]
return cfg
def _find_networking_config(self):
disable_file = os.path.join(
self.paths.get_cpath("data"), "upgraded-network"
)
if os.path.exists(disable_file):
return (None, disable_file)
available_cfgs = {
NetworkConfigSource.CMD_LINE: cmdline.read_kernel_cmdline_config(),
NetworkConfigSource.INITRAMFS: cmdline.read_initramfs_config(),
NetworkConfigSource.DS: None,
NetworkConfigSource.SYSTEM_CFG: self.cfg.get("network"),
}
if self.datasource and hasattr(self.datasource, "network_config"):
available_cfgs[
NetworkConfigSource.DS
] = self.datasource.network_config
if self.datasource:
order = self.datasource.network_config_sources
else:
order = sources.DataSource.network_config_sources
for cfg_source in order:
if not isinstance(cfg_source, NetworkConfigSource):
LOG.warning(
"data source specifies an invalid network cfg_source: %s",
cfg_source,
)
continue
if cfg_source not in available_cfgs:
LOG.warning(
"data source specifies an unavailable network"
" cfg_source: %s",
cfg_source,
)
continue
ncfg = self._get_network_key_contents(available_cfgs[cfg_source])
if net.is_disabled_cfg(ncfg):
LOG.debug("network config disabled by %s", cfg_source)
return (None, cfg_source)
if ncfg:
return (ncfg, cfg_source)
if not self.cfg.get("network", True):
LOG.warning("Empty network config found")
return (
self.distro.generate_fallback_config(),
NetworkConfigSource.FALLBACK,
)
def _apply_netcfg_names(self, netcfg):
try:
LOG.debug("applying net config names for %s", netcfg)
self.distro.networking.apply_network_config_names(netcfg)
except Exception as e:
LOG.warning("Failed to rename devices: %s", e)
def _get_per_boot_network_semaphore(self):
return namedtuple("Semaphore", "semaphore args")(
helpers.FileSemaphores(self.paths.get_runpath("sem")),
("apply_network_config", PER_ONCE),
)
def _network_already_configured(self) -> bool:
sem = self._get_per_boot_network_semaphore()
return sem.semaphore.has_run(*sem.args)
def apply_network_config(self, bring_up):
"""Apply the network config.
Find the config, determine whether to apply it, apply it via
the distro, and optionally bring it up
"""
netcfg, src = self._find_networking_config()
if netcfg is None:
LOG.info("network config is disabled by %s", src)
return
def event_enabled_and_metadata_updated(event_type):
return update_event_enabled(
datasource=self.datasource,
cfg=self.cfg,
event_source_type=event_type,
scope=EventScope.NETWORK,
) and self.datasource.update_metadata_if_supported([event_type])
def should_run_on_boot_event():
return (
not self._network_already_configured()
and event_enabled_and_metadata_updated(EventType.BOOT)
)
if (
self.datasource is not None
and not self.is_new_instance()
and not should_run_on_boot_event()
and not event_enabled_and_metadata_updated(EventType.BOOT_LEGACY)
):
LOG.debug(
"No network config applied. Neither a new instance"
" nor datasource network update allowed"
)
# nothing new, but ensure proper names
self._apply_netcfg_names(netcfg)
return
# refresh netcfg after update
netcfg, src = self._find_networking_config()
# ensure all physical devices in config are present
self.distro.networking.wait_for_physdevs(netcfg)
# apply renames from config
self._apply_netcfg_names(netcfg)
# rendering config
LOG.info(
"Applying network configuration from %s bringup=%s: %s",
src,
bring_up,
netcfg,
)
sem = self._get_per_boot_network_semaphore()
try:
with sem.semaphore.lock(*sem.args):
return self.distro.apply_network_config(
netcfg, bring_up=bring_up
)
except net.RendererNotFoundError as e:
LOG.error(
"Unable to render networking. Network config is "
"likely broken: %s",
e,
)
return
except NotImplementedError:
LOG.warning(
"distro '%s' does not implement apply_network_config. "
"networking may not be configured properly.",
self.distro,
)
return
def read_runtime_config():
return util.read_conf(RUN_CLOUD_CONFIG)
def fetch_base_config(*, instance_data_file=None) -> dict:
return util.mergemanydict(
[
# builtin config, hardcoded in settings.py.
util.get_builtin_cfg(),
# Anything in your conf.d or 'default' cloud.cfg location.
util.read_conf_with_confd(
CLOUD_CONFIG, instance_data_file=instance_data_file
),
# runtime config. I.e., /run/cloud-init/cloud.cfg
read_runtime_config(),
# Kernel/cmdline parameters override system config
util.read_conf_from_cmdline(),
],
reverse=True,
)
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